Do heat pumps make a difference on your electric bill? My house is 2000 sq feet and I currently have a 3 1/2 ton air conditioning unit. Gas heat in the winter. I live in TN and the problem I am having is I usually keep my air on 73 and during the summer months it runs all day and the temperature usually stays at 76. It cools down to the 73 around 7 or 8 at night. I have 11' ceilings in my living room and dining room. 1 bedroom and my kitchen have vaulted ceilings about 10' high. My eletric company says a heat pump might be better for us.